Were your readmissions also due to drugs? Drug-induced psychosis generally isn't permanent, although it trigger chronic psychotic conditions in people already predisposed to them. What exactly were your symptoms, and do you still have any? What reasons are your doctors giving you for not wanting to lower the dose? Even if you're symptom-free, telling a doctor "I want to stop this" about a medication you've been taking for years generally isn't going to be met with a positive reaction; a better approach might be to ask if you could try a lower maintenance dose, since you've not had any symptoms for a long time.